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Beech bark disease is a disease that causes mortality and defects in beech trees in the eastern United States, Canada and Europe. [ 1 ] [ 2 ] [ 3 ] In North America , the disease occurs after extensive bark invasion by Xylococculus betulae and the beech scale insect , Cryptococcus fagisuga . [ 4 ]
Aleurodiscus oakesii on tree bark. Aleurodiscus oakesii is the most common fungi to cause “smooth patch disease” on the nonliving outer bark of trees. This fungal infection can lead to trees shedding and leaving smooth and lighter patches of bark on the tree, giving “smooth patch” its meaning.
Foamy bark canker; Forest pathology; H. Helicotylenchus dihystera; Hypoxylon canker of shade trees; L. List of elm diseases; List of pistachio diseases;
Trees have natural chemicals that keep most fungi at bay, but climate change could be making trees more vulnerable, researcher says. Citizen scientists to study this tree disease found in ...
However, the energy required for new foliage weakens the trees. Oaks—a favorite food source for spongy moth larva—produce a reduced acorn crop for years after a defoliating event. Animals that rely on acorns are thus affected; but some animals benefit from the spongy moth, namely those that prey on the caterpillars (larva).
The Index of Plant Diseases in the United States lists 133 fungi and 10 other causes of diseases on Carya species. Most of the fungi are saprophytes, but a few are damaging to foliage, produce cankers, or cause trunk or root rots. The most common disease of pignut hickory from Pennsylvania southward is a trunk rot caused by Poria spiculosa ...
Fagus grandifolia is a large deciduous tree [6] growing to 16–35 metres (52–115 feet) tall, [7] with smooth, silver-gray bark.The leaves are dark green, simple and sparsely-toothed with small teeth that terminate each vein, 6–12 centimetres (2 + 1 ⁄ 4 – 4 + 3 ⁄ 4 inches) long (rarely 15 cm or 6 in), with a short petiole.
The affected area is very shallow and never show the "open-faced", perennial, target-shape typical of many canker diseases of trees (e.g., Nectria canker). Instead, in TCD the bark remains firmly attached to the canker face making the necrotic areas very difficult to observe. Branch cankers usually are not visible until the outer bark is shaved ...
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